Use single URL for all languages - if enabled, URL of the base language will be used for all the other languages (for backward compatibility with old systems).

Show language in the URL - defines whether to display or not the language name in the SEO names.

For example: If the Show language in the URL option is enabled and the English language is used the SEO name will be http://example.com/en/adidas-mens-climacool-mesh-polos.html. If the Show language in the URL option is disabled, the SEO name will behttp://example.com/adidas-mens-climacool-mesh-polos.html.